Ethics to Freecycle/ Craig's List Giveaways?

Well, not FIFO, but first come first served.

When you are offering something for free through freecyle or Craig's List, is there an ethical obligation to accept the offer of the first person who responds to your soliciation, or can you, based on other criteria, choose a person who didn't respond first.

I am giving away a couch

I've been meaning to do it for a while, but now that I'm moving I have to.

I tried offering it on freecycle firstbut I only had one person who was interested, and then they flaked out.

I offered it on Craig's List today, and I've had a few replies. I did offer it to the first person who responded, but they flaked out too.

I have two more respones. Am I ethcially obligated to offer it to the next in line, or can I skip them?

What if I said that the reason I may want to skip #2 and go to #3 is that #3 wrote an email in full sentences in English, and can pick it up in the evening, and the #2 is someone who obviously does not have English as a first language, and can only pick it up at 5 AM or late at night?